No more useless than blind blanket assumptions, which was the point. > Yes, lead exposure would have likely had similar detrimental effects on human cognition

No more useless than blind blanket assumptions, which was the point. > Yes, lead exposure would have likely had similar detrimental effects on human cognition and IQ 2000 years ago as it does today. ...these effects would have been the same in the past... I challenge you to consider that details matter, and one of those details is that the recent past through today has seen significantly more exposure to airborne lead than existed 2,000 years ago.